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  4. In the manufacture of iron from hematite the function of lime stone is as

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Q. In the manufacture of iron from hematite the function of lime stone is as

Chhattisgarh PMTChhattisgarh PMT 2004

Solution:

Lime stone is a flux. Ore contains some impurities which have high melting point.
Flux is used to remove these infusible impurities in the form of fusible slag.
Infusible impurities $+$ flux $=$ fusible slag
In the metallurgy of iron to remove the acidic impurity of $SiO _{2}$ present, a basic flux lime stone $\left( CaCO _{3}\right)$ issued.
$CaCO_3 \xrightarrow{800^{\circ}C} CaO + CO_2$
$CaO + SiO_2 \xrightarrow{1000^{\circ}C} \underset{\text{Calcium silicate (slag)}}{CaSiO_3}$